Flower-shaped FeCoNiMnPt high-entropy magnetic alloy powder and preparation method thereof

Abstract

The application relates to a flower-shaped FeCoNiMnPt high-entropy magnetic alloy powder and a preparation method thereof. The technical scheme is as follows: acetylacetone iron, acetylacetone cobalt, acetylacetone nickel, acetylacetone manganese and acetylacetone platinum are respectively dissolved in oleylamine at equal concentrations, ultrasonic dispersion is carried out, and a solution A is obtained; octadecyl trimethyl ammonium bromide and glucose are respectively dissolved in the solution A at equal concentrations, ultrasonic dispersion is carried out, the obtained solution B is added into a sealed container, the sealed container is placed into a high-pressure reaction kettle, then is placed into a hydrothermal oven, heat preservation is carried out, cooling is carried out, and the sealed container is taken out; the obtained solution C is subjected to centrifugal treatment, washing, drying, cooling, and the magnetic alloy powder is obtained; the crucible containing the magnetic alloy powder is placed into a tube type atmosphere furnace, heat preservation is carried out at 450-650 DEG C, cooling is carried out, and the flower-shaped FeCoNiMnPt high-entropy magnetic alloy powder is prepared. The application has the advantages of simple process, low cost, high production efficiency, large specific surface area of the prepared product and high saturation magnetization.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of high-entropy magnetic alloy powder, and particularly relates to a flower-shaped FeCoNiMnPt high-entropy magnetic alloy powder and a preparation method thereof. BACKGROUND

[0002] High-entropy magnetic alloy is an alloy composed of five or more than five elements in equal atomic ratio or near equal atomic ratio. The alloy is widely used in aerospace, automobiles, catalysts, biological medicine and other fields due to excellent magnetic properties. Since the prepared high-entropy magnetic alloy powder has a complex process and a small specific surface area, the small specific surface area is not conducive to enhancing the magnetic anisotropy, coercivity and saturation magnetization and other magnetic properties. Therefore, the development of high-entropy magnetic alloy powder with high specific surface area has been concerned by people.

[0003] The patent technology of "FeCoNiMo high-entropy alloy powder oxygen evolution catalyst and preparation method thereof" (CN114150330A) first puts Fe, Co, Ni and Mo metal blocks into a vacuum arc melting furnace for multiple melting under a protective atmosphere to obtain a FeCoNiMo alloy ingot with uniform composition. Then, the alloy ingot is put into a vacuum induction melting gas atomization powder preparation equipment to melt the alloy. When the alloy liquid flows into the atomization chamber for gas atomization dispersion, the alloy powder is obtained after cooling. Finally, the powder is classified and screened to obtain the FeCoNiMo high-entropy alloy powder product. However, the cost is high and the preparation process is complex.

[0004] The patent technology of "Method for preparing high-entropy alloy type electrocatalytic oxygen evolution reaction catalyst by high-energy ball milling" (CN110079824B) mixes magnetic metal powders in equal atomic mass ratio or close to atomic mass ratio. After long-time ball milling by using a high-energy ball mill, a uniformly dispersed two-phase metal solid solution flaky powder is obtained. However, there is a serious cold welding phenomenon between the powder and the ball mill jar and the grinding balls, which easily introduces impurities, resulting in low saturation magnetization.

[0005] The patent technology of "Preparation method and application of high-entropy alloy catalyst" (CN117696071A) uses an aqueous solution to prepare a colloidal polymer nanosheet precursor. Then, five or more than five different metal salts are weighed and dissolved in a solvent. The precursor is added dropwise to the mixture for grinding. Finally, the high-entropy magnetic alloy is obtained after calcination and cooling. The powder prepared by this method has a small specific surface area.

[0006] In summary, the existing preparation technology of high-entropy magnetic alloy powder has problems such as high cost, complex preparation process, easy introduction of impurities, and the prepared high-entropy magnetic alloy powder has a small specific surface area and low saturation magnetization. SUMMARY

[0007] The present application aims to overcome the deficiencies of the prior art, and aims to provide a preparation method of flower-shaped FeCoNiMnPt high-entropy magnetic alloy powder with simple process, low cost and high production efficiency, and the flower-shaped FeCoNiMnPt high-entropy magnetic alloy powder prepared by the method has large specific surface area and high saturation magnetization.

[0008] To achieve the above-mentioned purpose, the technical solution adopted by the present application has the following specific steps:

[0009] Step 1, according to the concentration of 0.002-0.01 mol / L, acetylacetone iron, acetylacetone cobalt, acetylacetone nickel, acetylacetone manganese and acetylacetone platinum are dissolved in oleylamine with equal concentration, ultrasonic dispersion is carried out at room temperature for 40-80 min, and solution A is obtained.

[0010] Step 2, according to the concentration of 0.004-0.02 mol / L, octadecyl trimethyl ammonium bromide and glucose are dissolved in the solution A with equal concentration, ultrasonic dispersion is carried out at room temperature for 20-40 min, and solution B is obtained.

[0011] Step 3, according to the solution B accounting for 40-70% of the volume of the sealed container, the solution B is added into the sealed container; then the sealed container is placed into a high-pressure reaction kettle, and then the high-pressure reaction kettle is placed into a hydrothermal oven, and is kept at 140-240 DEG C for 6-18 h, and is naturally cooled to room temperature; the sealed container in the high-pressure reaction kettle is taken out, and solution C is obtained.

[0012] Step 4, the solution C is subjected to centrifugal treatment at 3000-8000 r / min and room temperature, and is washed with deionized water and anhydrous ethanol alternately for 3-4 times; drying is carried out at 50-60 DEG C for 6-12 h, and natural cooling is carried out, and a magnetic alloy powder is obtained.

[0013] Step 5, the magnetic alloy powder is placed into a crucible, and then the crucible is placed into a tube furnace, and is heated to 450-650 DEG C at a rate of 2-10 DEG C in an inert gas, and is kept for 2-4 h, and is naturally cooled to room temperature, and a flower-shaped FeCoNiMnPt high-entropy magnetic alloy powder is prepared.

[0014] The purity of the acetylacetone iron, acetylacetone cobalt, acetylacetone nickel, acetylacetone manganese and acetylacetone platinum is all greater than or equal to 98%.

[0015] The purity of the oleylamine is 80-90%.

[0016] The purity of the octadecyl trimethyl ammonium bromide is greater than or equal to 98%.

[0017] The purity of the glucose is greater than or equal to 98%.

[0018] The sealed container is made of polytetrafluoroethylene.

[0019] The inert gas is argon or nitrogen.

[0020] By adopting the above technical solution, the present invention has the following advantages compared with the prior art:

[0021] 1. In this invention, a prepared solution B is added to a sealed container, placed in a high-pressure reactor, and then placed in a hydrothermal oven for heat preservation, natural cooling, centrifugation, washing, drying, and heat treatment under inert gas conditions to obtain flower-shaped FeCoNiMnPt high-entropy magnetic alloy powder. The raw materials used in this invention are readily available, require no complex or expensive equipment, have low production costs, and the preparation process is simple.

[0022] 2. This invention employs a hydrothermal method, using oleylamine with a long-chain alkyl structure as the solvent. Its amino group (-NH2) coordinates with the metal precursor, stabilizing the metal ions and preventing premature reduction that could lead to an alloy with uneven composition. In a sealed container, as temperature and pressure increase, octadecyltrimethylammonium bromide self-assembles and aggregates to form a flower-like template. Its positively charged trimethylammonium groups electrostatically interact with the metal ions in the solution, promoting the enrichment of metal ions on the template surface. Glucose, possessing reducing properties, slowly reduces the metal ions to the alloy. Finally, heat treatment enhances the stability of the flower-like structure, preventing deformation or collapse. The flower-like structure, composed of multiple lamellar structures, significantly increases the specific surface area. Magnetic grains are aligned along a specific direction; when the magnetization direction aligns with the grain's easy magnetization direction, magnetization is more easily saturated. Furthermore, the composition contains a large amount of magnetic elements iron, cobalt, and nickel, which improves the saturation magnetization of the flower-shaped FeCoNiMnPt high-entropy magnetic alloy powder. The saturation magnetization is measured to be 128.3–138.2 emu / g. Therefore, the flower-shaped FeCoNiMnPt high-entropy magnetic alloy powder prepared by this invention has a large specific surface area and a high saturation magnetization.

[0023] 3. This invention can control the yield of high-entropy magnetic alloy powder by changing the size of the sealed container, making it suitable for large-scale production. By changing the reaction temperature and time, the production rate of high-entropy magnetic alloy powder can be increased. Therefore, the production efficiency of the flower-shaped FeCoNiMnPt high-entropy magnetic alloy powder prepared by this invention is high.

[0024] Therefore, the present invention has the characteristics of simple process, low cost and high production efficiency, and the flower-shaped FeCoNiMnPt high-entropy magnetic alloy powder prepared has a large specific surface area and high saturation magnetization intensity. Attached Figure Description

[0025] Figure 1The image shows the XRD pattern of a flower-shaped FeCoNiMnPt high-entropy magnetic alloy powder prepared according to the present invention.

[0026] Figure 2 for Figure 1 SEM image of flower-shaped FeCoNiMnPt high-entropy magnetic alloy powder shown.

[0027] Figure 3 for Figure 1 The VSM diagram of the flower-shaped FeCoNiMnPt high-entropy magnetic alloy powder is shown. Detailed Implementation

[0028] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but this is not intended to limit the scope of protection thereof.

[0029] A flower-shaped FeCoNiMnPt high-entropy magnetic alloy powder and its preparation method. The specific steps of the method described in this embodiment are as follows:

[0030] Step 1: Dissolve iron acetylacetone, cobalt acetylacetone, nickel acetylacetone, manganese acetylacetone, and platinum acetylacetone in oleylamine at equal concentrations of 0.002–0.01 mol / L, and ultrasonically disperse at room temperature for 40–80 min to obtain solution A.

[0031] Step 2: Dissolve octadecyltrimethylammonium bromide and glucose in solution A at equal concentrations of 0.004–0.02 mol / L, and ultrasonically disperse at room temperature for 20–40 min to obtain solution B.

[0032] Step 3: Add solution B to the sealed container, making sure that solution B occupies 40-70% of the sealed container's volume; then place the sealed container into a high-pressure reactor, and then place the high-pressure reactor into a water-heated oven, keeping it at 140-240℃ for 6-18 hours, and allowing it to cool naturally to room temperature; remove the sealed container from the high-pressure reactor to obtain solution C.

[0033] Step 4: Centrifuge the solution C at 3000-8000 r / min and room temperature, wash it alternately with deionized water and anhydrous ethanol 3-4 times, dry it at 50-60℃ for 6-12 h, and cool it naturally to obtain magnetic alloy powder.

[0034] Step 5: Place the magnetic alloy powder into a crucible, then place the crucible in a tube atmosphere furnace, heat it to 450-650°C at a rate of 2-10°C in an inert gas, hold it at that temperature for 2-4 hours, and then allow it to cool naturally to room temperature to obtain flower-shaped FeCoNiMnPt high-entropy magnetic alloy powder.

[0035] The inert gas is argon or nitrogen.

[0036] In this specific implementation:

[0037] The purity of the iron acetylacetone, cobalt acetylacetone, nickel acetylacetone, manganese acetylacetone, and platinum acetylacetone is ≥98%.

[0038] The purity of the oleylamine is 80-90%;

[0039] The purity of the octadecyltrimethylammonium bromide is ≥98%;

[0040] The purity of the glucose is ≥98%;

[0041] The sealed container is made of polytetrafluoroethylene.

[0042] The details will not be repeated in the examples.

[0043] Example 1

[0044] A flower-like FeCoNiMnPt high-entropy magnetic alloy powder and its preparation method. The specific steps of the method described in this embodiment are as follows:

[0045] Step 1: Dissolve iron acetylacetone, cobalt acetylacetone, nickel acetylacetone, manganese acetylacetone, and platinum acetylacetone in oleylamine at equal concentrations of 0.006 mol / L, and ultrasonically disperse at room temperature for 60 min to obtain solution A.

[0046] Step 2: Dissolve octadecyltrimethylammonium bromide and glucose in solution A at equal concentrations of 0.01 mol / L, and then sonicate at room temperature for 30 min to obtain solution B.

[0047] Step 3: Add solution B to the sealed container so that it occupies 60% of the sealed container's volume; then place the sealed container into a high-pressure reactor, and then place the high-pressure reactor into a water-heated oven, keep it at 200°C for 12 hours, and let it cool naturally to room temperature; remove the sealed container from the high-pressure reactor to obtain solution C.

[0048] Step 4: Centrifuge the solution C at 6000 r / min and room temperature, wash it three times alternately with deionized water and anhydrous ethanol, dry it at 55℃ for 9 h, and cool it naturally to obtain magnetic alloy powder.

[0049] Step 5: Place the magnetic alloy powder into a crucible, then place the crucible in a tube furnace, heat it to 550°C at a rate of 6°C in an inert gas, hold it at that temperature for 3 hours, and then allow it to cool naturally to room temperature to obtain flower-shaped FeCoNiMnPt high-entropy magnetic alloy powder.

[0050] The inert gas is argon.

[0051] The flower-shaped FeCoNiMnPt high-entropy magnetic alloy powder prepared in this embodiment was tested and found to have a saturation magnetization of 138.2 emu / g.

[0052] Example 2

[0053] A flower-like FeCoNiMnPt high-entropy magnetic alloy powder and its preparation method. The specific steps of the method described in this embodiment are as follows:

[0054] Step 1: Dissolve iron acetylacetone, cobalt acetylacetone, nickel acetylacetone, manganese acetylacetone, and platinum acetylacetone in oleylamine at equal concentrations of 0.002 mol / L, and ultrasonically disperse at room temperature for 40 min to obtain solution A.

[0055] Step 2: Dissolve octadecyltrimethylammonium bromide and glucose in solution A at equal concentrations of 0.004 mol / L, and then sonicate at room temperature for 20 min to obtain solution B.

[0056] Step 3: Add solution B to the sealed container, making sure that solution B occupies 40% of the sealed container's volume; then place the sealed container into a high-pressure reactor, and then place the high-pressure reactor in a water-heated oven, keeping it at 140°C for 6 hours, and allowing it to cool naturally to room temperature; remove the sealed container from the high-pressure reactor to obtain solution C.

[0057] Step 4: Centrifuge the solution C at 3000 r / min and room temperature, wash it three times alternately with deionized water and anhydrous ethanol, dry it at 50℃ for 6 h, and cool it naturally to obtain magnetic alloy powder.

[0058] Step 5: Place the magnetic alloy powder into a crucible, then place the crucible in a tube furnace, heat it to 450°C at a rate of 2°C in an inert gas, hold it at that temperature for 2 hours, and then allow it to cool naturally to room temperature to obtain flower-shaped FeCoNiMnPt high-entropy magnetic alloy powder.

[0059] The inert gas is nitrogen.

[0060] The flower-shaped FeCoNiMnPt high-entropy magnetic alloy powder prepared in this embodiment was tested and found to have a saturation magnetization of 135.6 emu / g.

[0061] Example 3

[0062] A flower-like FeCoNiMnPt high-entropy magnetic alloy powder and its preparation method. The specific steps of the method described in this embodiment are as follows:

[0063] Step 1: Dissolve iron acetylacetone, cobalt acetylacetone, nickel acetylacetone, manganese acetylacetone, and platinum acetylacetone in oleylamine at equal concentrations of 0.004 mol / L, and ultrasonically disperse at room temperature for 50 min to obtain solution A.

[0064] Step 2: Dissolve octadecyltrimethylammonium bromide and glucose in solution A at equal concentrations of 0.008 mol / L, and then sonicate at room temperature for 25 min to obtain solution B.

[0065] Step 3: Add solution B to the sealed container so that it occupies 50% of the sealed container's volume; then place the sealed container into a high-pressure reactor, and then place the high-pressure reactor in a water-heated oven and keep it at 180°C for 9 hours, then let it cool naturally to room temperature; remove the sealed container from the high-pressure reactor to obtain solution C.

[0066] Step 4: Centrifuge the solution C at 5000 r / min and room temperature, wash it three times alternately with deionized water and anhydrous ethanol, dry it at 53℃ for 8 h, and cool it naturally to obtain magnetic alloy powder.

[0067] Step 5: Place the magnetic alloy powder into a crucible, then place the crucible in a tube atmosphere furnace, heat it to 500°C at a rate of 4°C in an inert gas, hold it at that temperature for 2 hours, and then allow it to cool naturally to room temperature to obtain flower-shaped FeCoNiMnPt high-entropy magnetic alloy powder.

[0068] The inert gas is nitrogen.

[0069] The flower-shaped FeCoNiMnPt high-entropy magnetic alloy powder prepared in this embodiment was tested and found to have a saturation magnetization of 133.4 emu / g.

[0070] Example 4

[0071] A flower-like FeCoNiMnPt high-entropy magnetic alloy powder and its preparation method. The specific steps of the method described in this embodiment are as follows:

[0072] Step 1: Dissolve iron acetylacetone, cobalt acetylacetone, nickel acetylacetone, manganese acetylacetone, and platinum acetylacetone in oleylamine at equal concentrations of 0.01 mol / L, and ultrasonically disperse at room temperature for 80 min to obtain solution A.

[0073] Step 2: Dissolve octadecyltrimethylammonium bromide and glucose in solution A at equal concentrations of 0.02 mol / L, and then sonicate at room temperature for 40 min to obtain solution B.

[0074] Step 3: Add solution B to the sealed container so that it occupies 70% of the sealed container's volume; then place the sealed container into a high-pressure reactor, and then place the high-pressure reactor in a water-heated oven and keep it at 240°C for 18 hours, allowing it to cool naturally to room temperature; remove the sealed container from the high-pressure reactor to obtain solution C.

[0075] Step 4: Centrifuge the solution C at 8000 r / min and room temperature, wash it four times alternately with deionized water and anhydrous ethanol, dry it at 60℃ for 12 h, and cool it naturally to obtain magnetic alloy powder.

[0076] Step 5: Place the magnetic alloy powder into a crucible, then place the crucible in a tube furnace, heat it to 650°C at a rate of 10°C in an inert gas, hold it at that temperature for 4 hours, and then allow it to cool naturally to room temperature to obtain flower-shaped FeCoNiMnPt high-entropy magnetic alloy powder.

[0077] The inert gas is argon.

[0078] The flower-shaped FeCoNiMnPt high-entropy magnetic alloy powder prepared in this embodiment was tested and found to have a saturation magnetization of 132.8 emu / g.

[0079] Example 5

[0080] A flower-like FeCoNiMnPt high-entropy magnetic alloy powder and its preparation method. The specific steps of the method described in this embodiment are as follows:

[0081] Step 1: Dissolve iron acetylacetone, cobalt acetylacetone, nickel acetylacetone, manganese acetylacetone, and platinum acetylacetone in oleylamine at equal concentrations of 0.008 mol / L, and sonicate at room temperature for 70 min to obtain solution A.

[0082] Step 2: Dissolve octadecyltrimethylammonium bromide and glucose in solution A at equal concentrations of 0.015 mol / L, and then sonicate at room temperature for 35 min to obtain solution B.

[0083] Step 3: Add solution B to the sealed container so that it occupies 65% of the sealed container volume; then place the sealed container into the high-pressure reactor, and then place the high-pressure reactor in a water-heated oven and keep it at 220°C for 15 hours, and let it cool naturally to room temperature; remove the sealed container from the high-pressure reactor to obtain solution C.

[0084] Step 4: Centrifuge the solution C at 7000 r / min and room temperature, wash it four times alternately with deionized water and anhydrous ethanol, dry it at 58℃ for 10 h, and cool it naturally to obtain magnetic alloy powder.

[0085] Step 5: Place the magnetic alloy powder into a crucible, then place the crucible in a tube atmosphere furnace, heat it to 600°C at a rate of 8°C in an inert gas, hold it at that temperature for 3 hours, and then allow it to cool naturally to room temperature to obtain flower-shaped FeCoNiMnPt high-entropy magnetic alloy powder.

[0086] The inert gas is argon.

[0087] The flower-shaped FeCoNiMnPt high-entropy magnetic alloy powder prepared in this embodiment was tested and found to have a saturation magnetization of 128.3 emu / g.

[0088] This specific implementation method has the following advantages compared with the prior art:

[0089] 1. In this specific embodiment, the prepared solution B is added to a sealed container, placed in a high-pressure reactor, and then placed in a hydrothermal oven for heat preservation, natural cooling, centrifugation, washing, drying, and heat treatment under inert gas conditions to obtain flower-shaped FeCoNiMnPt high-entropy magnetic alloy powder. The raw materials used in this specific embodiment are readily available, do not require complex and expensive equipment, have low production costs, and the preparation process is simple.

[0090] 2. This specific embodiment employs a hydrothermal method, using oleylamine with a long-chain alkyl structure as the solvent. Its amino group (-NH2) coordinates with the metal precursor, stabilizing the metal ions and preventing premature reduction that could lead to an alloy with uneven composition. In a sealed container, as temperature and pressure increase, octadecyltrimethylammonium bromide self-assembles and aggregates to form a flower-like template. Its positively charged trimethylammonium groups electrostatically interact with the metal ions in the solution, promoting the enrichment of metal ions on the template surface. Glucose, possessing reducing properties, slowly reduces the metal ions to the alloy. Finally, heat treatment enhances the stability of the flower-like structure, preventing deformation or collapse. The flower-like structure, composed of multiple lamellar structures, significantly increases the specific surface area. Magnetic grains are arranged along a specific direction; when the magnetization direction aligns with the grain's easy magnetization direction, magnetization is more easily saturated. Furthermore, the composition contains a large amount of magnetic elements iron, cobalt, and nickel, increasing the saturation magnetization intensity of the flower-like FeCoNiMnPt high-entropy magnetic alloy powder.

[0091] The flower-like FeCoNiMnPt high-entropy magnetic alloy powder prepared according to this specific embodiment is shown in the attached figure. Figure 1 The image shows the XRD pattern of the flower-like FeCoNiMnPt high-entropy magnetic alloy powder prepared in Example 1. Figure 2 forFigure 1 SEM image of flower-shaped FeCoNiMnPt high-entropy magnetic alloy powder shown. Figure 3 for Figure 1 The image shows a VSM diagram of the flower-like FeCoNiMnPt high-entropy magnetic alloy powder. (From...) Figure 1 It is known that the flower-like FeCoNiMnPt high-entropy magnetic alloy powder possesses both face-centered cubic and body-centered cubic phase structures, with the formation of the body-centered cubic structure being beneficial to improving magnetic properties; from Figure 2 It can be seen that the flower-like FeCoNiMnPt high-entropy magnetic alloy powder is composed of multiple plates bonded together to form a flower-like structure, with uniform particle size and a large specific surface area; Figure 3 It is known that the flower-like FeCoNiMnPt high-entropy magnetic alloy powder exhibits typical soft magnetic material characteristics. Due to the presence of a large number of magnetic elements in its composition and the alignment of magnetic grains along a specific direction in its flower-like structure, the prepared flower-like FeCoNiMnPt high-entropy magnetic alloy powder, after testing, shows a saturation magnetization of 128.3–138.2 emu / g. Therefore, this specific embodiment possesses a large specific surface area and a high saturation magnetization.

[0092] 3. This specific embodiment can control the yield of high-entropy magnetic alloy powder by changing the size of the sealed container, making it suitable for large-scale production. By changing the reaction temperature and time, the production rate of flower-shaped FeCoNiMnPt high-entropy magnetic alloy powder can be increased. Therefore, the production efficiency of the flower-shaped FeCoNiMnPt high-entropy magnetic alloy powder prepared by this specific embodiment is high. Thus, this specific embodiment features simple process, low cost, and high production efficiency, and the prepared flower-shaped FeCoNiMnPt high-entropy magnetic alloy powder has a large specific surface area and high saturation magnetization.

Claims

1. A method for preparing flower-shaped FeCoNiMnPt high-entropy magnetic alloy powder, characterized in that, The specific steps of the preparation method are as follows: Step 1: Dissolve iron acetylacetone, cobalt acetylacetone, nickel acetylacetone, manganese acetylacetone, and platinum acetylacetone in oleylamine at equal concentrations of 0.002–0.01 mol / L, and ultrasonically disperse at room temperature for 40–80 min to obtain solution A; Step 2: Dissolve octadecyltrimethylammonium bromide and glucose in solution A at equal concentrations of 0.004–0.02 mol / L, and ultrasonically disperse at room temperature for 20–40 min to obtain solution B; Step 3: Add solution B to the sealed container, making sure that solution B occupies 40-70% of the sealed container's volume; then place the sealed container into a high-pressure reactor, and then place the high-pressure reactor into a water-heated oven, keeping it at 140-240℃ for 6-18 hours, and allowing it to cool naturally to room temperature; remove the sealed container from the high-pressure reactor to obtain solution C; Step 4: Centrifuge the solution C at 3000-8000 r / min and room temperature, wash it alternately with deionized water and anhydrous ethanol 3-4 times, dry it at 50-60℃ for 6-12 h, and cool it naturally to obtain magnetic alloy powder. Step 5: Place the magnetic alloy powder into a crucible, then place the crucible in a tube atmosphere furnace, heat it to 450-650°C at a rate of 2-10°C in an inert gas, hold it at that temperature for 2-4 hours, and then allow it to cool naturally to room temperature to obtain flower-shaped FeCoNiMnPt high-entropy magnetic alloy powder.

2. The method for preparing flower-shaped FeCoNiMnPt high-entropy magnetic alloy powder according to claim 1, characterized in that, The purity of the acetylacetone iron, acetylacetone cobalt, acetylacetone nickel, acetylacetone manganese, and acetylacetone platinum is ≥98%.

3. The method for preparing flower-shaped FeCoNiMnPt high-entropy magnetic alloy powder according to claim 1, characterized in that, The purity of the oleylamine is 80-90%.

4. The method for preparing flower-shaped FeCoNiMnPt high-entropy magnetic alloy powder according to claim 1, characterized in that, The purity of the octadecyltrimethylammonium bromide is ≥98%.

5. The method for preparing flower-shaped FeCoNiMnPt high-entropy magnetic alloy powder according to claim 1, characterized in that, The purity of the glucose is ≥98%.

6. The method for preparing flower-shaped FeCoNiMnPt high-entropy magnetic alloy powder according to claim 1, characterized in that, The sealed container is made of polytetrafluoroethylene.

7. The method for preparing flower-shaped FeCoNiMnPt high-entropy magnetic alloy powder according to claim 1, characterized in that, The inert gas is argon or nitrogen.

8. A flower-shaped FeCoNiMnPt high-entropy magnetic alloy powder, characterized in that... The flower-shaped FeCoNiMnPt high-entropy magnetic alloy powder is prepared by the method for preparing flower-shaped FeCoNiMnPt high-entropy magnetic alloy powder according to any one of claims 1 to 7.

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